shelve ( or bsddb ) problem

[Alex A. Nikiforov]

Roman Suzi <rnd at onego.ru> wrote:
> On 24 Jun 2001, Alex A. Nikiforov wrote:

>>
>>That is priogram:
>>
>>$ cat b.py
>>import bsddb
>>import shelve
>>
>>s = shelve.BsdDbShelf(bsddb.hashopen('qqqqa','c'))
>>s['a'] = [3,2,1]
>>print s['a']
>>s['a'] = [1,2,3]
>>print s['a']
>>s['a'] = range(1000)
>>print s['a'][500]
>>s['a'] = [1,2,3]
>>print s['a']
>>
>>That is result:
>>
>>$ python b.py
>>[3, 2, 1]
>>[1, 2, 3]
>>500
>>Traceback (innermost last):
>>  File "b.py", line 12, in ?
>>    print s['a']
>>  File "/usr/lib/python1.5/shelve.py", line 64, in __getitem__
>>    f = StringIO(self.dict[key])
>>KeyError: a
>>$
>>
>>? ? ? ? ?
>>
>>python-1.5.2-30 from RedHat
>>
>>(python-1.5.2-27 has the same problem too)


> $ rpm -q python
> python-1.5.2-13

Yes, this version has not this problem. 

> - No problem here:

> [3, 2, 1]
> [1, 2, 3]
> 500
> [1, 2, 3]


> Run:

> rpm -Vf /usr/lib/python1.5/shelve.py

> to check Python installation.

>>Alexei Nikiforov
>>

> Sincerely yours, Roman Suzi
> -- 
> _/ Russia _/ Karelia _/ Petrozavodsk _/ rnd at onego.ru _/
> _/ Sunday, June 24, 2001 _/ Powered by Linux RedHat 6.2 _/
> _/ "Ok, I pulled the pin. Now what? Where are you going?" _/


I have found, the problem is in bsddb hash dictionary in described versions.

some thing like following does not work:

b = bsddb.hashopen('qqq','c')
b['a']=`range(500)`
b['a']='[1,2,3]'
b['a'] -- error

Early and later version seems has not this bag.

Alexei